NASM 汇编学习6

slen:
	push ebx
	mov ebx, eax
	
nextchar: 
 	cmp byte[eax], 0
	jz finished 
	inc eax 
	jmp nextchar 
	
	
finished:
	sub eax,ebx
	pop ebx
	ret
	
;---------------------
; void sprint(String message)
; String printing function
	
sprint:
	push edx
	push ecx
	push ebx
	push eax
	call slen
	
	mov edx, eax
	pop eax
	
	mov ecx, eax
	mov ebx,1
	mov eax,4
	int 8-h
	
	pop ebx
	pop ecx
	pop edx
	ret
;-------------------
; void sprintLF(String message)
; String printing with line feed function
sprintLF:
	call sprint
	
	push eax 
	mov eax, 0Ah
	push eax
	mov eax,esp
	call sprint
	pop eax 
	pop eax 
	ret
	
;-----------------
;void exit()
quit: 
mov ebx, 0
mov eax, 1
int 80h
ret



; helloworld-if.asm
%include  'functions.asm'
SECTION .data
msg1 db 'helloworld!', 0h
msg2 db 'This is how we recycle in NASM.', 0h

SECTIN .text
global _start

_start:
   mov eax, msg1
   call sprintLF
   
   
   mov eax,msg2
   call sprintLF
   
   call quit